Linux vmlinuz images

[Denham Eva]

Hello,

I have done what I would call a standard install of FC3, the only real
mentionable change has been an increase in memory from 512 to 1GB.
My question is this when GRUB starts up and I press enter key for boot
choices. I have discovered two linuz images registered;
vmlinuz-2.6.9-1.667smp and vmlinuz-2.6.9-1.667.
I have tried booting with both and have not found nor noticed any real
difference.

Can anyone clarify what the difference is and where I can find
documentation on this?

Many thanks.
Denham.